Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
  • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
  • F01L1/02—Valve drive
  • F01L1/024—Belt drive
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/22—Compensation of inertia forces
  • F16F15/26—Compensation of inertia forces of crankshaft systems using solid masses, other than the ordinary pistons, moving with the system, i.e. masses connected through a kinematic mechanism or gear system
  • F16F15/264—Rotating balancer shafts

Definitions

• Fig. 1 is an isometric view of an engine having an accessory drive for driving a balance shaft in accordance with the invention
• Fig. 2 is an isometric view of the accessory drive and accessories of the engine of Fig. 1.
• Fig. 1 shows an engine 1 having a front end 2 and a rear end 3.
• the front end 2 is provided with an accessory or secondary drive 4 in accordance with the invention and shown in more detail in Fig. 2.
• the drive pulley 5 is mounted on a drive shaft 27 which in turn is driven by a primary drive in the form of a chain drive 7 within the engine 1.
• chain drive 7 may be a belt drive, a gear drive, or any other conventional drive.
• the drive pulley 5 may be replaced by any suitable rotational member.
• the common rail fuel pump 26 is optional and the drive shaft 27 could be in communication with an alternative accessory type or a stand-alone shaft.
• the drive shaft 27 is rotatable at engine speed or greater.
• a rotary seal is provided on the drive shaft 27 between the engine 1 and the drive pulley 5 at a location generally indicated by the reference numeral 31 to prevent engine oil leakage or dirt ingress.
• the belt 6 is a synchronous belt having teeth 23 on a top face 24 and a bottom face 25 thereof.
• the belt 6 extends between the drive pulley 5, the alternator idler pulley 20, the first balance shaft pulley 21 and the second balance shaft pulley 22 so that the drive pulley 5 can effect contra-rotation of the first and second balance shafts 15, 16 via the belt 6.
• front end accessories may be driven by the belt 6 via suitable pulleys.
• the primary drive can be substantially contained within the engine while the accessory drive 4 can be external to the engine 1. Accordingly, as the drive for the engine accessories is taken from the drive pulley 5 via the belt 6, no conventional external drive is required to be taken directly from the front end of the crankshaft 9 on the engine 1. Accordingly, noise and vibration in the engine 1 of the invention is reduced. It is estimated that the reduction in noise can be as much as 25% or greater over engines having a conventional front end drive assembly. In addition, no rotary seal is required at the front end of the crankshaft 9.
• crankshaft cover plate 18 can be provided with its own seal or accessories mounted on the crankshaft nose can be provided with their own seals which can be more compact than seals normally required between mechanical linkages at the nose of the crankshaft 9.
• the rotary seal provided on the sprocket shaft 27 ensures sealing of the engine 1. Moreover, as the nose of the crankshaft 9 is liberated, the nose is made available for driving other engine accessories if required e.g. AC/DC generators, hydraulic pumps, compressors, engine speed generators, transfer gear boxes and the like.
• the engine 1 can have a lighter weight than conventional engines fitted with balance shafts driven by mechanical linkages at the nose of the crankshaft 9.
• the balance shafts 15, 16 could be mounted externally of the engine 1, but suspended underneath an oil sump 29 to be below the crankshaft 9. Such an arrangement allows the width of the engine 1 to be reduced (where the engine 1 is being used to power a machine, the width of the engine 1 can be critical as turning of the front wheels of the machine for steering can cause the wheels to engage the engine 1) .
• the belt 6 can also be directed using idler pulleys to substantially any configuration.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Aviation & Aerospace Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=9911086

Family Applications (1)

Country Status (5)

Families Citing this family (19)

Family Cites Families (22)

• 2001
  • 2001-03-20 GB GBGB0106858.4A patent/GB0106858D0/en not_active Ceased
• 2002
  • 2002-03-18 US US10/471,678 patent/US7070526B2/en not_active Expired - Fee Related
  • 2002-03-18 DE DE60230391T patent/DE60230391D1/de not_active Expired - Fee Related
  • 2002-03-18 EP EP02704940A patent/EP1370753B1/de not_active Expired - Fee Related
  • 2002-03-18 WO PCT/GB2002/001066 patent/WO2002075132A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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